import sys
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtGui import QIcon #图标类

class MainWins(QMainWindow):
    
    def __init__(self, parent=None):
        super(MainWins, self).__init__(parent)
        #设置主窗口标题
        self.setWindowTitle('第一个主窗口应用')

        #设置窗口的尺寸
        self.resize(400, 300)

        #获取状态栏
        self.status = self.statusBar()

        self.status.showMessage('只存在5秒', 5000)

if __name__ == '__main__':

    app = QApplication(sys.argv)
    # app.setWindowIcon()
    main = MainWins()
    main.show()
    sys.exit(app.exec_())
